Philip all I can say is that I used it on a piece of aircraft plywood. I waited the recommended cure time. I applied some 10% fuel and wiped it off almost immediately with a cloth and felt a drag. I touched it and it was sticky. I waited a few minutes and rubbed it with my fingers and it was gummy. For sure nothing I could use as a final clearcoat. It might be something that someone would say was fuelproof in that the fuel might not reach the underlying wood or paint if you want to put up with the sticky finish. A friend claims he uses it for fuel proofing firewalls but on the other hand he couldn't tell me if the firewalls are tacky. I'm not sure he doesn't have the regular urethane and the water based confused. I used the Minnwax product in the blue labeled can. You probably should just test it yourself and see if it fills your particular needs. I would not use it for a final coat on a glow powered plane. I could not find a regular polyurethane that did not have amber/yellowing qualities and seems to get worse with age. Test, test and test again. Good luck.